src/gallium/tests/graw/tri.c

   1 /* Display a cleared blue window.  This demo has no dependencies on
   2  * any utility code, just the graw interface and gallium.
   3  */
   4
   5 #include <stdio.h>
   6
   7 #include "state_tracker/graw.h"
   8 #include "pipe/p_screen.h"
   9 #include "pipe/p_context.h"
  10 #include "pipe/p_state.h"
  11 #include "pipe/p_defines.h"
  12
  13 #include "util/u_memory.h"      /* Offset() */
  14 #include "util/u_draw_quad.h"
  15
  16 enum pipe_format formats[] = {
  17    PIPE_FORMAT_R8G8B8A8_UNORM,
  18    PIPE_FORMAT_B8G8R8A8_UNORM,
  19    PIPE_FORMAT_NONE
  20 };
  21
  22 static const int WIDTH = 300;
  23 static const int HEIGHT = 300;
  24
  25 static struct pipe_screen *screen = NULL;
  26 static struct pipe_context *ctx = NULL;
  27 static struct pipe_surface *surf = NULL;
  28 static void *window = NULL;
  29
  30 struct vertex {
  31    float position[4];
  32    float color[4];
  33 };
  34
  35 static struct vertex vertices[3] =
  36 {
  37    {
  38       { 0.0f, -0.9f, 0.0f, 1.0f },
  39       { 1.0f, 0.0f, 0.0f, 1.0f }
  40    },
  41    {
  42       { -0.9f, 0.9f, 0.0f, 1.0f },
  43       { 0.0f, 1.0f, 0.0f, 1.0f }
  44    },
  45    {
  46       { 0.9f, 0.9f, 0.0f, 1.0f },
  47       { 0.0f, 0.0f, 1.0f, 1.0f }
  48    }
  49 };
  50
  51
  52
  53
  54 static void set_viewport( float x, float y,
  55                           float width, float height,
  56                           float near, float far)
  57 {
  58    float z = far;
  59    float half_width = (float)width / 2.0f;
  60    float half_height = (float)height / 2.0f;
  61    float half_depth = ((float)far - (float)near) / 2.0f;
  62    struct pipe_viewport_state vp;
  63
  64    vp.scale[0] = half_width;
  65    vp.scale[1] = half_height;
  66    vp.scale[2] = half_depth;
  67    vp.scale[3] = 1.0f;
  68
  69    vp.translate[0] = half_width + x;
  70    vp.translate[1] = half_height + y;
  71    vp.translate[2] = half_depth + z;
  72    vp.translate[3] = 0.0f;
  73
  74    ctx->set_viewport_state( ctx, &vp );
  75 }
  76
  77 static void set_vertices( void )
  78 {
  79    struct pipe_vertex_element ve[2];
  80    struct pipe_vertex_buffer vbuf;
  81    void *handle;
  82
  83    memset(ve, 0, sizeof ve);
  84
  85    ve[0].src_offset = Offset(struct vertex, position);
  86    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  87    ve[1].src_offset = Offset(struct vertex, color);
  88    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  89
  90    handle = ctx->create_vertex_elements_state(ctx, 2, ve);
  91    ctx->bind_vertex_elements_state(ctx, handle);
  92
  93
  94    vbuf.stride = sizeof( struct vertex );
  95    vbuf.max_index = sizeof(vertices) / vbuf.stride;
  96    vbuf.buffer_offset = 0;
  97    vbuf.buffer = screen->user_buffer_create(screen,
  98                                             vertices,
  99                                             sizeof(vertices),
 100                                             PIPE_BIND_VERTEX_BUFFER);
 101
 102    ctx->set_vertex_buffers(ctx, 1, &vbuf);
 103 }
 104
 105 static void set_vertex_shader( void )
 106 {
 107    void *handle;
 108    const char *text =
 109       "VERT\n"
 110       "DCL IN[0]\n"
 111       "DCL IN[1]\n"
 112       "DCL OUT[0], POSITION\n"
 113       "DCL OUT[1], COLOR\n"
 114       "  0: MOV OUT[1], IN[1]\n"
 115       "  1: MOV OUT[0], IN[0]\n"
 116       "  2: END\n";
 117
 118    handle = graw_parse_vertex_shader(ctx, text);
 119    ctx->bind_vs_state(ctx, handle);
 120 }
 121
 122 static void set_fragment_shader( void )
 123 {
 124    void *handle;
 125    const char *text =
 126       "FRAG\n"
 127       "DCL IN[0], COLOR, LINEAR\n"
 128       "DCL OUT[0], COLOR\n"
 129       "  0: MOV OUT[0], IN[0]\n"
 130       "  1: END\n";
 131
 132    handle = graw_parse_fragment_shader(ctx, text);
 133    ctx->bind_fs_state(ctx, handle);
 134 }
 135
 136
 137 static void draw( void )
 138 {
 139    float clear_color[4] = {1,0,1,1};
 140
 141    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 142    util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 143    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 144
 145    graw_save_surface_to_file(ctx, surf, NULL);
 146
 147    screen->flush_frontbuffer(screen, surf, window);
 148 }
 149
 150
 151 static void init( void )
 152 {
 153    struct pipe_framebuffer_state fb;
 154    struct pipe_resource *tex, templat;
 155    int i;
 156
 157    /* It's hard to say whether window or screen should be created
 158     * first.  Different environments would prefer one or the other.
 159     *
 160     * Also, no easy way of querying supported formats if the screen
 161     * cannot be created first.
 162     */
 163    for (i = 0;
 164         window == NULL && formats[i] != PIPE_FORMAT_NONE;
 165         i++) {
 166
 167       screen = graw_create_window_and_screen(0,0,300,300,
 168                                              formats[i],
 169                                              &window);
 170    }
 171
 172    ctx = screen->context_create(screen, NULL);
 173    if (ctx == NULL) {
 174       fprintf(stderr, "Unable to create context!\n");
 175       exit(3);
 176    }
 177
 178    templat.target = PIPE_TEXTURE_2D;
 179    templat.format = formats[i];
 180    templat.width0 = WIDTH;
 181    templat.height0 = HEIGHT;
 182    templat.depth0 = 1;
 183    templat.last_level = 0;
 184    templat.nr_samples = 1;
 185    templat.bind = (PIPE_BIND_RENDER_TARGET |
 186                    PIPE_BIND_DISPLAY_TARGET);
 187
 188    tex = screen->resource_create(screen,
 189                                  &templat);
 190    if (tex == NULL) {
 191       fprintf(stderr, "Unable to create screen texture!\n");
 192       exit(4);
 193    }
 194
 195    surf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 196                                   PIPE_BIND_RENDER_TARGET |
 197                                   PIPE_BIND_DISPLAY_TARGET);
 198    if (surf == NULL) {
 199       fprintf(stderr, "Unable to get tex surface!\n");
 200       exit(5);
 201    }
 202
 203    memset(&fb, 0, sizeof fb);
 204    fb.nr_cbufs = 1;
 205    fb.width = WIDTH;
 206    fb.height = HEIGHT;
 207    fb.cbufs[0] = surf;
 208
 209    ctx->set_framebuffer_state(ctx, &fb);
 210
 211    {
 212       struct pipe_blend_state blend;
 213       void *handle;
 214       memset(&blend, 0, sizeof blend);
 215       blend.rt[0].colormask = PIPE_MASK_RGBA;
 216       handle = ctx->create_blend_state(ctx, &blend);
 217       ctx->bind_blend_state(ctx, handle);
 218    }
 219
 220    {
 221       struct pipe_depth_stencil_alpha_state depthstencil;
 222       void *handle;
 223       memset(&depthstencil, 0, sizeof depthstencil);
 224       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 225       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 226    }
 227
 228    {
 229       struct pipe_rasterizer_state rasterizer;
 230       void *handle;
 231       memset(&rasterizer, 0, sizeof rasterizer);
 232       rasterizer.cull_face = PIPE_FACE_NONE;
 233       rasterizer.gl_rasterization_rules = 1;
 234       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 235       ctx->bind_rasterizer_state(ctx, handle);
 236    }
 237
 238    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 239    set_vertices();
 240    set_vertex_shader();
 241    set_fragment_shader();
 242 }
 243
 244 static void args(int argc, char *argv[])
 245 {
 246    int i;
 247
 248    for (i = 1; i < argc;) {
 249       if (graw_parse_args(&i, argc, argv)) {
 250          continue;
 251       }
 252       exit(1);
 253    }
 254 }
 255
 256 int main( int argc, char *argv[] )
 257 {
 258    args(argc, argv);
 259    init();
 260
 261    graw_set_display_func( draw );
 262    graw_main_loop();
 263    return 0;
 264 }